<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>标签选择器</title>
    <style type="text/css">
        /*
           div标签  修改字体颜色为蓝色，字体大小为30个像素，边框为1像素黄色实线
           span标签 边框为5像素蓝色虚线字体颜色为黄色 字体大小为20个像素

        */
        div{
            border: 1px solid yellow;
            color: blue;
            font-size: 30px;
        }
        span{
            border: 5px dashed blue;
            color: yellow;
            font-size: 20px;
        }
    </style>
</head>
<body>
<div >div标签1</div>
<div>div标签2</div>
<span>span标签1</span>
<span>span标签1</span>
<p>p段落标签1</p>
<p>p段落标签2</p>
</body>
</html>